Well that's DS fast asleep for the last hour & after settling himself too which I always think leads to a better sleep. So fingers crossed he sleeps as late again - I will relish the time in bed instead of fretting about him!!

My DD started doing this at 5 weeks. She had actually just been on hospital for refusing to eat to we were concerned obviously. Paediatrician was quite happy echoing the advice above of not waking a sleeping baby. He told us that after 4 weeks a healthy baby should be left alone to sleep as they wish.

My breastfed DD was sleeping from 7:30 - 6am ish at 11 weeks. She would feed three times between 4pm and 7pm and then sleep through. I did feel very lucky as all my friends with babies were exhausted and we were all getting a decent nights sleep.

If he is maintaining his weight and has gained weight nicely then fine. If he is underweight or struggling to gain then I would would wake as they can sleep to save energy. As I say if his weight is fine then yes he is fine to sleep. Well done.

Only know from a bf point of view, but my friend who is a mw told me at 11/12 weeks that 8hrs was perfectly fine, so would assume that, as ff is supposed to take longer to digest, then that should be fine. My ds has only done it four or so times out of ten days, but better than my three older boys who never slept longer than 90 min at a time until 9mths or so.